book Maths Puzzle Numerical Ability

a/2 - 3/a (a divided by 2 minus 3 over a)

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3<2X-1<7 is the inequality that I need help solving. Can you please help me learn to solve this problem. I need the answer for homework plus I have to show my work. Thank You!! Given the following equation: - 4x + 5y = 20, rewrite in functional notation, then determine the value of f(-2).